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Annotation of sys/arch/i386/stand/libsa/unixsys.S, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: unixsys.S,v 1.4 2004/01/13 23:54:07 millert Exp $     */
                      2:
                      3: /*
                      4:  * Copyright (c) 1997 Michael Shalayeff
                      5:  * All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  *
                     16:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     17:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
                     18:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     19:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     20:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     21:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     22:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     23:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     24:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     25:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     26:  * SUCH DAMAGE.
                     27:  *
                     28:  */
                     29:
                     30: #include <machine/asm.h>
                     31: #include <sys/syscall.h>
                     32:
                     33:
                     34: #ifdef __STDC__
                     35: #define RSYSCALL(x) \
                     36:        ENTRY(u##x); \
                     37:                movl     $(SYS_##x), %eax; \
                     38:                jmp      1f
                     39: #else
                     40: #define RSYSCALL(x) \
                     41:        ENTRY(u/**/x); \
                     42:                movl     $(SYS_/**/x), %eax; \
                     43:                jmp      1f
                     44: #endif
                     45:
                     46:        .globl  _errno
                     47:
                     48: RSYSCALL(open)
                     49: RSYSCALL(read)
                     50: RSYSCALL(write)
                     51: RSYSCALL(ioctl)
                     52: RSYSCALL(close)
                     53: RSYSCALL(exit)
                     54:
                     55: 1:
                     56:        int     $0x80
                     57: 2:     jnc     3f
                     58:        movl    %eax, _errno
                     59:        movl    $-1, %eax
                     60:        movl    $-1, %edx
                     61: 3:     ret
                     62:
                     63: ENTRY(__syscall)
                     64:        movl    $(SYS___syscall), %eax
                     65:        jmp     1b
                     66:
                     67: ENTRY(syscall)
                     68:        popl    %ecx    /* rta */
                     69:        popl    %eax    /* syscall number */
                     70:        pushl   %ecx
                     71:        int     $0x80
                     72:        pushl   %ecx
                     73:        jmp     2b